Former Donald Trump campaign official Rick Gates pleaded guilty to two criminal charges in special counsel Robert Mueller's investigation of Russian meddling in the 2016 presidential campaign and related activities.

Gates is now the third Trump associate known to be working with Mueller's investigation, and his plea deal will put the spotlight on former Trump campaign chairman Paul Manafort.

Prosecutors are trying to pressure Manafort to speak with prosecutors about what he knows, particularly about the campaign.

President Trump continued to advocate for arming teachers in response to the school shooting in Florida, saying that security guards "don't love the children" the way that teachers do.

Before Nikolas Cruz killed 17 people at his former high school in Florida on February 14, law enforcement officials received several calls from people concerned about the young man's guns and violent behavior. One caller said Cruz planned "to shoot up" an unnamed school.

Florida Governor Rick Scott (R) proposes changes to background checks and the minimum age to purchase a firearm following the school shooting at Marjory Stoneman Douglas High School.

President Donald Trump gives remarks at the 2018 Conservative Political Action Conference (CPAC) in Maryland.

Police Sgt. Jeff Heinrich recounts calling his wife and son, who were in the school on the day of the Florida school shooting, after helping to rescue victims.

President Donald Trump makes a joke about his hair at the 2018 Conservative Political Action Conference (CPAC) in Maryland.

CNN anchor Alisyn Camerota asks NRA spokesperson Dana Loesch why she said "many in legacy media love mass shootings."

White House Communications Director Hope Hicks topped GQ's list for the most powerful people in Washington.

American Conservative Union Chairman Matt Schlapp and CNN's Alisyn Camerota get in a heated debate on the correlation between crime and gun control.

Missouri GOP Gov. Eric Greitens was indicted on Thursday amid looming allegations of sexual misconduct and blackmail following an admission of an affair last month.

He was charged in St. Louis with a first-degree felony invasion of privacy, according to the Missouri court system.

In a statement Thursday, Greitens denied committing any crime and instead called the situation "a personal mistake" from his time prior to taking office.

Special counsel Robert Mueller has filed new charges against former Donald Trump campaign officials Paul Manafort and Rick Gates.

In the 37-page indictment in Virginia, prosecutors describe a "scheme" in which the two longtime business partners allegedly laundered $30 million, failed to pay taxes for almost 10 years and used real estate they owned to fraudulently secure more than $20 million in loans.

The indictments show increasing pressure from Mueller on the former top Trump campaign officials and highlight his aggressive effort to investigate Russian interference in the 2016 US presidential election and any related matters uncovered during the investigation.

When Nikolas Cruz started shooting last week, an armed deputy stationed at the Florida school rushed to the building.

But instead of going inside, the officer waited outside for four minutes as the shooter killed students and faculty behind the walls, authorities said.

School resource officer Scot Peterson "never went in" despite taking a position on the west side of the Building 12, where most of the carnage happened, Broward County Sheriff Scott Israel said Thursday.

CNN's Anderson Cooper says President Donald Trump is going against the NRA by supporting legislation that would raise the age limit to purchase a rifle, but questions whether he will follow through.

Teachers from Columbine High School, Sandy Hook Elementary School and Marjory Stoneman Douglas High School discuss arming educators and how they can work to end school shootings.